Adam e



(No Model.)

A. E. SGHATZ.

TELEPHONE SOUND TRANSMITTER.

No. 449,180. Patented Mar. 31, 1891.

WWNESSES Mam-0 jam 5 UNITED STATES ADAM It. SCIIATZ, OF NElY PATENT OFFICE.

YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 449,180, dated March 31, 1891.

Application filed March 1, 1888. Serial No. 265,824. (No model.)

T 0 all whom it may concern.-

Be it known that I, ADAM E. SCHATZ, a citi- Zen of the United States, and a resident of New York city, in the county of New York and State of New York, have invented certain new and'useful Improvements in Telephone Sound-Oonveyers, of which the following is a specification.

My invention relates to improvements in instruments intended to convey the sound of the voice to the sound-transmitter of telephonic instruments; and the'objects of my improvements are the exclusion of other surrounding foreign noises, thus enabling the speaker to more distinctly convey the message to the hcarer and in such a low tone of voice that conversation may be had without persons near by hearing the same, and thus also preventing eavesdropping. I attain these objects by the instrument illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal cross-section. Fig. 2 is a longitudinal plan view showing the instrument attached to a telephone-in strument, ready for use. Fig. 3 shows one of the modes in which the instrumentmay be ai'iixed to the telephone-instrument.

Similarletters refer to similarparts th rou ghout the several views.

A is an ordinary cattle-horn, having the open ends a and a and the opening a cut into the outerorconvex side of the horn near the open end a and the cushion or elastic tip a at the small end of the horn. This tip a is provided for the purpose of tightly setting the end into the recess of the telephonetransmitter T The opening a of the instrument is preferably made of the same diameter as the openingi of the transmitter T so that the sound-wave may not be disturbed and may glide uninterrupted, to further facilitate which the interior of the horn is smoothed.

In use the horn or instrument may be held in the hand in any convenient position with the small end a set in the recess of the trans mitter T The opening a is brought closely to the mouth of the speaker, and the voicesound is emitted into the instrument and is thrown against the wall of the inner or concave side of the horn tangentially inward, and is crowded to the mouth of and into the transmitter, the surplus sound being forced out at the opening a.

It is to be understood that in use, when it is desired to prevent persons near by from overbearing the users voice or to prevent eavesdropping, the user will talk very low, and the sound-waves, owing to the peculiar shape of the horn, will nearly all pass to the transmitter, and those waves which pass out through opening a will be insufficient to be overheard; but this opening a is necessary, for in case of even a very slight surplus of sound, such sound would be returned from a closed end, and thereby interfere with the sound-waves passing to the transmitter. In case of loud talking the necessity of the opening a is the more apparent.

The upper portion of the body of the person speaking into the opening a of the cattle-horn A is in such close proximity to the large opening a at the bottom of the cattlehorn as to practically form a shield or soundbreaker, which will effectually prevent eavcsdropping while the speaker is using the instrument. This position of the instrument is not shown, because I find it more convenient to attach the instrument in the manner shown in Fig. 2, although the manner shown in Fig. 3, in which the instrument is provided with a recess Z2 into and around which is fitted the rubber disk-shaped tip 0, which disk 0 may be fastened to the telephone transmittor for the purpose of holding the horn in place, or anyother manner of holding the instrument A may be employed. I may also cut the opening a in any side of the instrument A without very materially departing from its effectiveness. It is obvious that the instrument may be made of any material.

I am aware that trumpet-like instruments, in which the voice is thrown into the large month, have been used for the same purpose, but none to my knowledge have been used constructed on the plan shown in my drawings and specification.

\Vhat I claim as new and desire to secure by Letters Patent, is-

1. The horn-shaped sound-conveyer for telephones, provided with an opening a in its convex side near the large open end there of, substantially as described.

York and State of New York, this 18th'day of February, A. D.-1888.

ADAM E. SOHATZ.

\Vi tnesses ALEX. U. MAYER, F. M. MURPHY. 

